Accession Number : AD0278484

Title :   PROPORTIONS OF PRESSURE-VESSEL HEADS DESIGNED FOR MINIMUM WEIGHT BY THE MISES YIELD CRITERION

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : HOFFMAN,GEORGE A.

Report Date : JUN 1962

Pagination or Media Count : 1

Abstract : The minimal-weight shapes of head closures for long cylindrical pressure vessels, such as rocket tanks and pressurized fuselages, are derived. Head geometries, weights, and stresses are calculated for thin-shell heads of isotropic m terials with uniform internal pressure by restricting tensile stresses to the plastici y ellipse--the limiting curve of yielding. Ellipsoidal and torispherical domes of varying thickness are derived by considering membrane stresses only, these highly efficient shapes being shallower and weighing up to 15 per cent less than the corresponding h mispherical capping closure. The least-weight ovaloid shape that avoids discontinuity str sses near the cyliner-dome juncture is evaluated, and it appears that the choice of head shapes based on this last criterion leads to heads that are h avier and deeper than pure membrane shapes that have the additional shell thickness required by the juncture stresses. (Author)

Descriptors :   DESIGN

Distribution Statement : APPROVED FOR PUBLIC RELEASE